Imprtwement



ai?. z'Tz,

lre Proof Ceiling ,Ic l E92.

d illsrtsi)'-l n. BAUMANN AND Geenen ii.

'missy Lern, or emesso, 4nrtinois.

Specification forming part of Leiters Patent No. lliltlf, dated June 7, 1870.

To' @ZZ when?, it may concern.

Be it known that We, F. BAUMANN and GEORGE F. LETZoi` the city;T of Chicago, in the connty'of Cook and State of lllinois, have invented certain Improvements in Fire-Proof Ceilings, of which the followingis a speelde-a tion, reference being` had to lthe 4accompanying drawings.

. @nr invention relates to fire-proof ceilings;

and .it consists in the novelfconstruction and take the'ordinary iron E-beanis, A, generally employed for the pai-pose, and arrange them ,in the usual manner, placing them at dis-l tances apartsuitehle for the strength required, 'and provide their bottoni faces with dovet-ailed,

or i grating, as clearly Vshown in Figli. The beams A may be provided vwith this grating before or after they arearr'anged in position, and it may form an integral part of the beam or loe attached to it, as desired. lletween'these beams A We place transversely metallic beams l5, as shown in. Fig. l. These beams .il are shaped as shown in'Fig. 3, and have on their under side flanges D, provided with perforations b, as shown in Fig. 4. Their 'ends are also provided on their `ander side with narrower angesc, and are shaped to lit the eontour of 'the flanges of thevbeams A, as shown in Fig. l, and also to allowl the face of the ianges D to be' iiush with the 'face ofthe dovetailed grating' C. The ends of the flanges l), when the bea-ins are in position', are parallel with the dovetailed grating (l, and forni with the nearest line of grating a devel-ail, as shown in Fig. 1. After the beams A and E are thus arranged, We place between 'the latter, and. so as to rest upon their ilanges, 'brick E or tile, or light metallic grates or other suitable inaterial.. -When brick or tile are used, their iinder surfaces may be suitably prepared to se cure the adhesion of plaster, and they may loe connected with plaster or other material itted for the purpose of scouring their adhesion. Plaster can now be applied to the ceiling, and when applied it w ill key fast to the dovetailed grating ou the bottoni of the beams A andv to the lian'ges of the beams l., and also adhere Ato the brick, tile, metallic grating, or other articles'used to iiil nn the snaceshetweenthe transverse beams.

It is obvious that any desired strengthmay be given to a ceiling constructed in this manner by making the heen/is of requisite size and arranging them so as to secure the object in View. ln this Way .we are able to combine all the elements desirable in a nre-proof ceiling. lt is simple, strong-land durable in its structnre. The plastering lwill adhere securely to it, and it is entirely tire-proof.

4Haring thus described our invention, what we claim isl l. A 'Iireprooi' ceiling consisting` of themetallicvgirder-beaxns A, with their dovetailed shaped grating C, and the metallic transverse beams B, provided with perforated flanges l), when constructed and arranged substantially as described. 1

2. The transverse metallic beams B, provided with perforated iianges, when constructed in the manner substantially as here in .(l'esorihed, and `for the purpose set forth.

W. H. Cnnnownrir, GEO. F. Kuise. 

